Indoor unit for air-conditioning apparatus

An indoor unit for an air-conditioning apparatus comprising a case including a front case and a back case, an air-sending fan accommodated in the case, and a heat exchanger unit provided to cover the air-sending fan and configured to exchange heat between refrigerant and air,

• the heat exchanger unit including
• a plurality of heat-transfer pipes extending in a vertical direction and forming a plurality of refrigerant passages in an air flow direction and a width direction of the case, and
• a plurality of headers connected to both ends of the plurality of heat-transfer pipes to allow the refrigerant to flow between the plurality of heat-transfer pipes,
• the plurality of headers including
• a plurality of division headers dividing and connecting the plurality of refrigerant passages arranged in the air flow direction and connecting in parallel the plurality of refrigerant passages arranged in the width direction of the case, and
• a return header connecting and turning back the plurality of refrigerant passages arranged in the air flow direction divided in the plurality of division headers and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction of the case,
• the heat exchanger unit including
• a first heat exchanger disposed at a side of the front case and including first heat-transfer pipes arranged in the width direction of the case and the air flow direction, and
• a second heat exchanger disposed at a side of the back case and including second heat-transfer pipes arranged in the width direction of the case and the air flow direction,
• at least either one of the first heat exchanger or the second heat exchanger including the return header,
• the first heat exchanger and the second heat exchanger being connected to form a continuous refrigerant passage,
• in each of the first heat exchanger and the second heat exchanger, the plurality of refrigerant passages causing counterflows.